utils.js
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utils.js
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	'use strict';

	/**
	* Waits until the specified selector to no longer match any elements in the QUnit test fixture.
	*
	* @param {string} selector The JQuery selector to check
	* @return {Promise}
	*/
	function waitUntilElementDisappears( selector ) {
	return waitUntilElementCount( selector, 0 );
	}

	/**
	* Waits until the specified selector appears in the QUnit test fixture.
	*
	* @param {string} selector The JQuery selector to check
	* @return {Promise}
	*/
	function waitUntilElementAppears( selector ) {
	return waitUntilElementCount( selector, 1 );
	}

	/**
	* Waits until the specified selector matches the specified count of elements in
	* the QUnit test fixture.
	*
	* @param {string} selector The JQuery selector to check
	* @param {number} count The number of elements to wait for
	* @return {Promise}
	*/
	function waitUntilElementCount( selector, count ) {
	// eslint-disable-next-line no-jquery/no-global-selector
	const $qunitFixture = $( '#qunit-fixture' );
	return new Promise( ( resolve ) => {
	// Check every 10ms if the class matches any element in the QUnit test fixture.
	// If the class is no longer present, then resolve is called.
	// If this condition is not met ever, then QUnit will time the test out after 6s.
	function runCheck() {
	setTimeout( () => {
	if ( $( selector, $qunitFixture ).length === count ) {
	return resolve();
	}
	runCheck();
	}, 10 );
	}
	runCheck();
	} );
	}

	module.exports = {
	waitUntilElementDisappears: waitUntilElementDisappears,
	waitUntilElementAppears: waitUntilElementAppears,
	waitUntilElementCount: waitUntilElementCount
	};